export default {
	namespaced: true,

	state: () => ({
		cart: JSON.parse(uni.getStorageSync('cart') || '[]')
	}),

	mutations: {
		addToCart(state,goods){
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			if(!findResult){
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			
			this.commit('m_cart/saveToStorage')
		},
		saveToStorage(state){
			uni.setStorageSync('cart',JSON.stringify(state.cart))
		},
		//更新购物车勾选状态
		updateGoodsState(state,goods){
			const findResult = state.cart.find( x => x.goods_id === goods.goods_id)
			if(findResult){
				findResult.goods_state = goods.goods_state
				this.commit('m_cart/saveToStorage')
			}
		},
		//更新购物车商品数量
		updateGoodsCount(state,goods){
			const findResult = state.cart.find( x => x.goods_id === goods.goods_id)
			
			if(findResult){
				findResult.goods_count = goods.goods_count
				this.commit('m_cart/saveToStorage')
			}
		},
		//删除对应商品
		removeGoodsById(state,goods){
			state.cart = state.cart.filter(x => x.goods_id !== goods.goods_id)
			this.commit('m_cart/saveToStorage')
		},
		// 更新购物车中所有商品的勾选状态
		updateAllGoodsState(state,newState){
			state.cart.forEach(x => x.goods_state = newState)
			this.commit('m_cart/saveToStorage')
		}
	},

	getters: {
		// 购物车中商品的总数量
		total(state){
			// let c = 0
			// state.cart.forEach(x => c += x.goods_count)
			// return c
			return state.cart.reduce( (total,item) => total += item.goods_count,0 )
		},
		// 购物车中勾选的数量
		checkedCount(state){
			return state.cart.filter(x => x.goods_state).reduce( (total,item) => total += item.goods_count,0 )
		},
		//已勾选商品的总价格
		checkedGoodsAmount(state){
			return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count * item.goods_price,0 ).toFixed(2)
		}
	}
}
